Intense look at Virgo Southern Extension

Monthly Notices of the Royal Astronomical Society, Mar 2013

We collected data on radial velocities and distances of galaxies to elucidate structure and kinematics of the filament attached to the Virgo cluster from south. In the region ${\rm RA} = [12{.\!\!^{ {\mathrm {h}}}}5{--}13{.\!\!^{ {\mathrm {h}}}}5]$, Dec. = [−20°,0°] there are 171 galaxies with radial velocities VLG < 2000 km s−1, and 98 of them have distance estimates. This galaxy cloud, called as ‘Virgo Southern Extension’, is situated just on the edge of the Virgo ‘zero-velocity surface’. The mean distance to Virgo SEx, 17 ± 2 Mpc, and the average radial velocity, 1172 ± 23 km s−1, are very close to the Virgo cluster ones. In supergalactic coordinates the Virgo SEx dimensions are 15 × 7 × 2 Mpc, where the major axis is directed along the line of sight, the second major axis is directed towards the Virgo core and the minor one is perpendicular to the supergalactic plane. This flattened cloud consists of a dozen virialized groups with the total K-band luminosity of 1.7 × 1012 L⊙ and the total virial mass of 6.3 × 1013 M⊙, having a typical dark matter-to-stellar matter ratio of 37. The Hubble diagram for Virgo SEx galaxies exhibits a tendency of a Z-shaped wave with a velocity amplitude of ∼250 km s−1 that may be caused by a mass overdensity of ∼6 × 1013 M⊙, and in order of magnitude agrees with the sum of virial masses of the groups.

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Intense look at Virgo Southern Extension

Intense look at Virgo Southern Extension I. D. Karachentsev‹ 0 O. G. Nasonova‹ 0 0 Special Astrophysical Observatory of the Russian Academy of Sciences , Nizhnij Arkhyz, KChR 369167 , Russia A B S T R A C T We collected data on radial velocities and distances of galaxies to elucidate structure and kinematics of the filament attached to the Virgo cluster from south. In the region RA = [12h.5-13h.5], Dec. = [−20◦,0◦] there are 171 galaxies with radial velocities VLG < 2000 km s−1, and 98 of them have distance estimates. This galaxy cloud, called as 'Virgo Southern Extension', is situated just on the edge of the Virgo 'zero-velocity surface'. The mean distance to Virgo SEx, 17 ± 2 Mpc, and the average radial velocity, 1172 ± 23 km s−1, are very close to the Virgo cluster ones. In supergalactic coordinates the Virgo SEx dimensions are 15 × 7 × 2 Mpc, where the major axis is directed along the line of sight, the second major axis is directed towards the Virgo core and the minor one is perpendicular to the supergalactic plane. This flattened cloud consists of a dozen virialized groups with the total K-band luminosity of 1.7 × 1012 L and the total virial mass of 6.3 × 1013 M , having a typical dark matter-to-stellar matter ratio of 37. The Hubble diagram for Virgo SEx galaxies exhibits a tendency of a Z-shaped wave with a velocity amplitude of ∼250 km s−1 that may be caused by a mass overdensity of ∼6 × 1013 M , and in order of magnitude agrees with the sum of virial masses of the groups. galaxies; distances and redshifts 1 I N T R O D U C T I O N RA (J2000) Dec. 122310.3−135645 123001.8−114731 123103.8+014033 123104.5−080314 123217.5−073348 123223.6−014424 123245.6+000654 123308.0−003159 123337.0−045306 123355.2−104048 123529.5−034735 123537.5−075240 123539.4−110402 123551.0−034558 123714.1−102951 123735.9−085202 123746.5−024654 123748.3−012042 123902.5+005059 123918.7−003155 123944.5−070514 123959.4−113723 124002.8−010300 124003.1−114004 124008.9−002101 124012.9−054757 124048.5+002655 124122.9−030329 124128.9−031513 124129.2−004311 124232.7−012102 124232.8−000447 124248.9−122326 124318.5−012803 124403.5−054034 124428.8+002805 124433.2−021909 124445.6−002536 124454.1−090731 124508.7−002743 124532.0−003209 124541.4−060408 124541.6−020151 124547.9−002556 124603.5−083920 124637.5−040433 VLG 13.6 13.3 13.2 9.3 9.5 13.8 7.3 14.0 10.9 11.3 7.4 11.1 13.2 12.5 14.1 14.8 13.7 13.5 12.2 10.2 15.1 4.9 13.3 14.7 13.1 11.7 15.3 11.4 14.6 15.9 11.8 9.4 11.4 14.9 11.7 12.3 13.6 16.2 11.6 7.0 10.6 11.8 13.6 14.0 10.3 14.3 NGC 4594 NGC 4594 NGC 4437 NGC 4594 NGC 4594 NGC 4437 NGC 4594 NGC 4546 NGC 4594 NGC 4594 NGC 4546 NGC 4594 NGC 4546 NGC 4666 NGC 4666 NGC 4437 NGC 4594 NGC 4594 NGC 4666 NGC 4594 NGC 4666 NGC 4546 NGC 4666 NGC 4753 NGC 4753 NGC 4666 NGC 4594 NGC 4666 NGC 4697 NGC 4753 NGC 4666 NGC 4666 NGC 4697 NGC 4666 NGC 4666 NGC 4697 NGC 4666 NGC 4666 NGC 4697 NGC 4697 m−M Table 1 – continued RA (J2000) Dec. 124649.3+030023 124717.5−024340 124724.9−082431 124738.2−055203 124750.9−082816 124813.6−031958 124830.6−080232 124835.9−054803 124843.1−051514 124854.2−114035 124902.2−083953 124908.2−112435 124918.3−040059 124923.7−100706 124941.9−043447 124950.2+025110 124955.9−072527 125004.7−001357 125007.3+021452 125019.2−052147 125042.8−040921 125101.1−062335 125102.9−131412 125113.3−063329 125132.4−131948 125148.0−102717 125208.9+030715 125222.1−011159 125233.8−014349 125236.3−061720 125250.1−101837 125321.2+011609 125321.4−045841 125329.2+021006 125331.6−055540 125341.8−060502 125345.7−063720 125357.5−120631 125401.9−013030 125405.2−000604 125412.6+004809 125423.7−103214 125437.7+011933 125451.9−101452 125503.7−062210 125510.8−032351 125512.7+000700 125531.0−102353 125537.4−011948 125539.4−001549 125549.6−120319 125636.1−064904 125640.4−073340 125648.9−083131 125712.1−040932 125716.5−052045 125746.8−093801 125801.2+013433 125828.3−103437 125848.9−060646 125849.6−045319 125906.8−121340 125921.3−150232 VLG 1069 1420 1041 1170 860 954 1325 1071 1175 1145 1218 1219 1353 1131 1269 1024 1236 608 934 1367 1452 1325 1145 1327 1118 1086 900 1091 983 1363 664 992 1248 907 905 1303 1398 636 985 697 1033 1078 1061 1173 1141 1329 1212 1141 760 972 827 1206 1133 927 1377 1097 1310 979 1095 1442 1155 1122 1183 NGC 4753 NGC 4666 NGC 4697 NGC 4697 NGC 4594 NGC 4753 NGC 4697 NGC 4697 NGC 4697 NGC 4697 NGC 4697 NGC 4697 NGC 4697 NGC 4697 NGC 4753 NGC 4697 NGC 4753 NGC 4697 NGC 4697 NGC 4722 NGC 4697 NGC 4722 NGC 4697 NGC 4753 NGC 4753 NGC 4753 NGC 4697 NGC 4753 NGC 4697 NGC 4753 NGC 4697 NGC 4697 NGC 4753 NGC 4753 NGC 4753 NGC 4697 NGC 4753 NGC 4697 NGC 4697 NGC 4753 NGC 4697 NGC 4753 NGC 4594 NGC 4697 NGC 4697 NGC 4594 NGC 4697 NGC 4697 NGC 4753 NGC 4697 NGC 4697 m−M Table 1 – continued RA (J2000) Dec. 125945.1−005217 125952.4+033759 125956.3−192447 130005.1−152155 130017.0−122048 130017.6−030359 130043.5−154256 130058.7−000140 130100.7−015834 130103.7−015712 130105.2−052821 130107.0−133106 130110.9−053324 130203.3−145258 130204.1−112242 130214.4−171415 130300.6−080506 130316.7−172523 130412.1−045328 130413.1−053306 130419.1−073858 130431.2−033421 130431.8−025917 130446.6−025216 130456.0−075652 130456.1−094849 130505.8−080941 130507.7−062938 130514.3−075321 130548.9−080113 130618.4−173053 130701.7−074155 130756.7−164121 130848.7−064639 130857.2−153059 130940.7−075000 130947.5−101912 131038.6−095554 131158.9−120349 131203.0−065929 131305.5−162842 131431.2−162248 131449.2−162934 131449.8−165825 131459.4−163525 131504.1−162340 131656.2−163535 131658.5−163805 131742.8−010001 131841.2−082647 132020.2−123418 132028.9−195032 132041.0−165402 132119.6−130232 132416.2−164213 132442.1−194150 132509.3−122544 132550.3−093209 132636.6−092828 132726.3−173918 132847.0−173044 132948.8−175759 133439.7−121950 VLG 1139 1006 620 1260 1397 921 1189 1036 1216 1331 936 1121 1497 1203 1145 548 1553 546 765 951 1586 1219 1148 1122 1113 1288 1387 1016 958 1058 1265 1449 728 1519 1070 1605 1042 996 1932 1328 1778 1311 1993 1994 1698 1643 1953 1556 1106 1150 1261 1558 1518 1145 1307 1784 1003 1651 1063 1464 1267 1319 1347 15.2 15.7 13.7 11.4 11.3 13.4 13.4 9.5 13.6 12.7 13.8 13.5 11.3 11.0 11.6 11.6 10.2 10.8 11.0 8.2 10.4 11.7 13.6 14.3 10.7 13.7 11.9 8.9 10.5 7.6 13.0 12.3 12.5 8.5 7.7 8.2 10.0 14.0 12.0 10.2 10.5 12.7 9.6 11.7 8.6 12.2 12.6 7.6 13.7 11.6 10.1 13.8 10.9 12.0 12.3 10.6 12.5 14.1 13.0 12.8 10.2 7.6 12.2 NGC 4753 NGC 4753 NGC 4856 NGC 4753 NGC 4856 NGC 4753 NGC 4941 NGC 4856 NGC 4856 UGCA 320 NGC 4995 UGCA 320 NGC 4941 NGC 4995 LCRS B13 LCRS B13 NGC 4697 NGC 4941 NGC 4697 NGC 4697 NGC 4995 NGC 4995 NGC 5054 NGC 5044 NGC 5044 NGC 5054 NGC 5054 NGC 5044 NGC 5054 NGC 5084 NGC 5054 NGC 5170 NGC 5170 NGC 5170 NGC 5170 m−M N4437 N4546 N4594 N4666 N4722 N4697 N4753 N4856 UA320 N4941 N4995 N5054 N5170 RA (J2000.0) Dec. 123310.7+000446 123529.5−034735 124112.5−112103 124518.9−005318 125130.7−131929 125148.6−074321 125326.6−001502 125929.5−150142 130256.5−172146 130413.1−053306 130831.2−072620 131632.6−163759 132938.8−175442 VLG 10.40 10.52 11.59 11.20 9.96 11.59 11.54 10.94 8.9 10.71 11.00 10.97 11.05 11.61 11.73 13.17 12.86 10.50 13.23 12.96 12.22 8.5 12.08 11.91 12.80 12.62 30.01 30.38 30.52 31.11 30.92 30.87 31.47 31.44 29.32 31.22 31.64 31.18 31.84 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I. D. Karachentsev, O. G. Nasonova. Intense look at Virgo Southern Extension, Monthly Notices of the Royal Astronomical Society, 2013, 2677-2686, DOI: 10.1093/mnras/sts557